Pin-guard.



UNITED STATES. PATENT OFFICE.

ABRAHAM HURwITz, or NEW YoRK, N. Y., ASSIGNOR T0 LOUIS ROSENBERG, or NEW YORK, N. Y.

fin-GUARD.

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed June 8', 1915. Serial No. 32,886.

To all whom it may concern:

Be it known that I, ABRAHAM HURWITZ, a citizen of the United States, residing at 135 Canal street, in the city, county, and State of New York, have invented a new and useful Pin-Guard, and it consists in pin, and to permit the pin guard to move freely in an opposite direction, i. 6. toward the head of the pin. Third, to have the pin guard simple, durable and comparatively inexpensive. I attain these objects by the mechanism, one form of which is illustrated in the accompanying drawings or by any mechanical equivalent or obvious modification of the same.

In the drawings Figure 1 is an outside view or elevation of one form of the pin guard. Fig. 2 is a side elevation of one form of the pin and guard with the cover 12 of the case 12 removed, and showing the mechanism inclosed therein. Fig. 3 is an end elevation of my pin guard and pin shown in Figs. 1 and 2. Fig. 4 is an elevation of the sleeve 13, which is a detail of the mechanism of my pin guard shown in Figs. 2 and 3. Fig. 5 is a plan of my pin guard and pin shown in Figs. 1, 2 and 3 as connected: Fig. 6 is a sectional plan of the case 12 used for inclosing the mechanism of the pin guard, and shown with the pivots 17 which are formed in one with the case or are permanently connected thereto. Fig. 7 is an end view or plan of the sleeve 13 shown in Fig. 4:. Fig. 8 is an elevation of a preferred form of the clicks or clutching arms of my pin guard, drawn to a larger scale than in Fig. 2.

Similar numerals and letters refer to similar parts throughout the several views.

11 is the pin.

11 is the head of the pin; 11 is the point thereof.

12 is the case inclosing the mechanism of the pin guard.

13 is a sleeve slidable on the pin 11 and clicks as shown in the drawings.

with reference to the case12. 13 is an enlargement or drum on said sleeve 13, and hav ng slots 19 on opposite sides thereof; 13 is a knob or bead, atthe lower end of sald sleeve 13 for convenience in handling thesame.

14 is a socket or guide shown in Figs. 1, 2 and 3 as connected to the periphery of said case 12 and serving as a guide for the upper end of said sleeve 13.

15 is a helical spring acting in compresslon and abutting at one end against the Inner slde of the periphery of the casing 12 and at the other end against the end of the drum 13 16 are the extensions or wings of two rigid clutching arms or clicks designated as 16 in Fig. 2 or as 16 and 16 in Fig 8.

17 are the pivots or spindles for said clutching arms or clicks-16 or 16 and 16.

18 are stops for said wings 16; these are also permanently connected to said case 12.

The operation of the mechanism of my pin guard is as follows:'The pin 11 passing through the slotted sleeve 13 is clutched by the ends of the arms orclicks 16 'or 16* and 16, which ends pass through the slots 19 in the drum 13 provided for that purpose. The spring 15 presses on the end of the drum 13*, which transmits the pressure to the rigid clutching arms or clicks 16 or 16 and 16 by means of the edges of its walls adjacent to the slot 19; the clicks 16 or 16 and 16, acting as moving struts, multiply the pressure exerted on them by the spring 15, in accordahce with the laws of mechanics relating thereto, and by reason of the position of the said clutching arms or In the modification illustrated in Fig. 8 one of the clutching arms or clicks 16 has a knife edge at the end, and the other clutching arm or click 16 terminates in a dull end'formed by the arc of "a 'circle of a suitable radius; this arrangement is designed for the purpose of having the points of contact of the two clutching arms or clicks substantially opposite each other. It is evident that, as the position'of the clicks 16", or 16 and 16 is more or less oblique with relation to the pin 11, the latter will readily pass downward, be-

tween said clicks, and unhindered by the nresward passage thereof by its'friction with the inside of said sleeve 13, said friction tending slightly to relieve the pressure of said drum on said clicks by reason of its acting in a direction contrary to the said pressure.

Moving the case 12 with the mechanism contained therein upward will have the same ef fect as moving the pin 11 downward. But the pin 11 will not pass upward nor the case 12 downward unless the pressure of the spring be relieved by pulling the knob or bead 13 which will cause said spring 15 to be compressed under the end of the drum 13 and the rigid clutching arms or clicks 16 or 16 and 16 will then exert no pressure on said pin 11. To prevent the said clutching arms or clicks from falling too far apart in diameter to a considerable extent, and

that the clutching arms 16 or 16 and 16 are adapted to lit a large number of pins by turning on said spindles or pivots 17; it is also evident that the slots or openings 19 in the sleeve 13 or in the enlargement there of 13 will permit said arms to act on said pin 11 through a considerable range of their position.

One of the clutching arms or struts 16 or 16 and 16 may be left out if desired and one slot only may be used in the sleeve 13; the number of clutching arms or clicks 16 or 16 and 16 may also be increased as well 7 as the number ofslots in the sleeve 13.

The sleeve 13 may be omitted, if desired, or the enlargement 13* therein.

Many other modifications could be made in the design of the details of my pin guard without departing from the main scope of my invention. 1 do not therefore restrict myself to the exact shape and arrangement of the parts of my device as shown in the drawings.

What I claim as my invention and desire to secure by Letters Patent is:

1. A pin guard comprising a case, a pair of rigid clutching arms, pivotally connected thereto, each at the outer end thereof, and abutting at the inner end thereof against said pin, each of said arms being almost but not quite perpendicular to said pin, when in operation, and adapted to act as a moving strut, thereby multiplying the pressure exerted thereon in clutching said pin, a means for producing a pressure on said arms, and

a means whereby said pressure may be relieved.

2. A pin guard comprising a case, a pair of rigid clutching arms of equal length, pivotally connected thereto at their outer ends and abutting at their inner ends against said pin, said clutching arms being almost but not quite perpendicular to said pin, when in operation, and adapted to act as moving struts, thereby multiplying any pressure exerted thereon in clutching said pin, a knife edge at the inner end of one of said arms,

the inner end of the other arm terminating in a short cylindrical surface of a suitable radius, thereby adapting the inner ends of said arms to be opposite each other through a considerable range of movement, and thereby assuring a firm grip on said pin, a means for producing a pressure on said arms, and a means whereby said pressure may be relieved.

3. A pin guard comprising a case, a pair of rigid clutching arms, pivotally connected thereto, each at the outer end thereof, and abutting at the inner end thereof against said pin, each of said arms being almost but not quite perpendicular to said pin, when in operation, and adapted to act as a moving strut, thereby multiplying any pressure eX- erted thereon in clutching said 0111, a sleeve encompassing said pin, an enlargement on said sleeve, said sleeve having an opening for the inner end of each of said arms to pass through during a considerable range of movement, a helical spring abutting at one end thereof against said enlargement, thereby producing a pressure on said arm or arms, and a means whereby said pressure may be relieved.

4. A pin guard comprising acase, a pair of rigid clutching arms pivotally connected thereto, each at the outer end thereof and abutting at the inner end thereof against said pin, each of said arms being almost but notquite perpendicular to said pin, when in operation, and adaptedto act as a moving strut, thereby multiplying any pressure exerted thereon when clutching said pin, a sleeve encompassing said pin, said sleeve having an opening for the inner end of each of said arms to pass through during a considerable range of movement, a means for producing a pressure on said arms, a means whereby said pressure may be relieved and stops connected to said case and adapted to prevent the inner end of each of said arms from passing out of said opening, when said pressure is relieved.

ABRAHAM HURWITZ.

Witnesses ABRAHAM KA'rz, CHARLES SILBERMAN.

Gopies of this patent may he obtained for five cents each. by addressing the Commissioner of Patents,

Washington, D. 0. 

